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[Conduction aphasia].

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Aphasia, Wernicke↗
PubMed1995

Repetition and the arcuate fasciculus.

According to the traditional model of language organization, repetition deficits arise following damage to the arcuate fasciculus of the dominant hemisphere (conduction aphasia). Conduction aphasia may result from lesions that spare the arcuate fasciculus. However, these patients have atypical language organization. We describe a man with normal language architecture who underwent a resection of the anterior portion of his arcuate fasciculus and retained his ability to repeat words and sentences. We propose that the arcuate fasciculus is not necessary for speech repetition by the lexical route.

Adult↗
PubMed1991

Errors resembling semantic paralexias in Spanish-speaking aphasics.

Forty-one Spanish-speaking left-hemisphere-damaged patients were selected and divided into seven groups (transcortical, Broca's aphasia, conduction aphasia, Wernicke's aphasia, anomic aphasia, alexia without agraphia, and global aphasia). A reading battery composed of eight different subtests was given to each patient (reading of letters, reading of syllables, reading of pseudowords, reading of words, reading of sentences, understanding commands, reading and comprehension of texts, and logographic reading). Different types of reading errors were analyzed. Only in the logographic reading subtest were some word-recognition errors found, resembling semantic paralexias. It is proposed that semantic paralexias in English (and other languages) depend upon the partial logographic nature of the reading system. The importance of cross-linguistic analysis of reading errors, taking into account reading system idiosyncracies, is emphasized.

Adult↗
PubMed2004

Clinical-anatomical correlation in a selective phonemic speech production impairment.

Although phonemic paraphasias are common in aphasic disorders, including Broca's aphasia, conduction aphasia and transcortical motor aphasia, selective phonemic speech production impairment, or phonemic disintegration, is unusual. A patient with a selective phonemic speech production disorder underwent clinical, neuropsychological and structural neuroradiological assessment over a period of 6 years. The disorder was characterised by phonemic paraphasias (phonemic disintegration) with preserved comprehension and naming. Imaging showed a focal lesion in the white matter of the left precentral gyrus and, to a lesser extent, the posterior part of the left middle frontal gyrus, with overlying cortical atrophy. Biopsy of the lesion, after several years of observation, showed a calcified haemangioma. Clinical-anatomical correlation in this case suggests the importance of primary motor cortex of the inferior precentral (pre-Rolandic) gyrus and subjacent white matter in phoneme production, with sparing of the posterior inferior frontal gyrus (Broca's area).

Aphasia, Broca↗
PubMed2005

Perisylvian language networks of the human brain.

Early anatomically based models of language consisted of an arcuate tract connecting Broca's speech and Wernicke's comprehension centers; a lesion of the tract resulted in conduction aphasia. However, the heterogeneous clinical presentations of conduction aphasia suggest a greater complexity of perisylvian anatomical connections than allowed for in the classical anatomical model. This article re-explores perisylvian language connectivity using in vivo diffusion tensor magnetic resonance imaging tractography. Diffusion tensor magnetic resonance imaging data from 11 right-handed healthy male subjects were averaged, and the arcuate fasciculus of the left hemisphere reconstructed from this data using an interactive dissection technique. Beyond the classical arcuate pathway connecting Broca's and Wernicke's areas directly, we show a previously undescribed, indirect pathway passing through inferior parietal cortex. The indirect pathway runs parallel and lateral to the classical arcuate fasciculus and is composed of an anterior segment connecting Broca's territory with the inferior parietal lobe and a posterior segment connecting the inferior parietal lobe to Wernicke's territory. This model of two parallel pathways helps explain the diverse clinical presentations of conduction aphasia. The anatomical findings are also relevant to the evolution of language, provide a framework for Lichtheim's symptom-based neurological model of aphasia, and constrain, anatomically, contemporary connectionist accounts of language.

Adult↗